#17570: ToricRationalDivisorClass: Integer/Rational mixed up
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: geometry | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17570 | b2c68ca56a6235b049c260c0cf181a252935037c
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
So, what you really want is a free `ZZ`-module generated by vectors which
might have coefficients in `QQ`, is that right?
That's actually legal:
{{{
sage: M = (ZZ^2).span([(1,1/3),(0,1/2)])
sage: M
Free module of degree 2 and rank 2 over Integer Ring
Echelon basis matrix:
[ 1 1/3]
[ 0 1/2]
sage: M.base_ring()
Integer Ring
sage: type(M.basis()[0])
<type 'sage.modules.vector_rational_dense.Vector_rational_dense'>
}}}
So the problem might be solvable by deriving from
{{{
sage: type(M)
<class 'sage.modules.free_module.FreeModule_submodule_pid_with_category'>
}}}
instead of `FreeModule_generic_pid`.
--
Ticket URL: <http://trac.sagemath.org/ticket/17570#comment:6>
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